Add component factory function for runtime.start()

[ERnsTL]

Task 4 — Generate Component Factory Function

Objective

Remove manual match component_name.as_str() logic.

Requirements

Add to generated file:

pub fn instantiate_and_run_component(
    name: &str,
    args: ComponentArgs
) -> Option<Box<dyn FbpComponent>> {
    match name {
        "Repeat" => Some(Box::new(RepeatComponent::new(args))),
        "Drop" => Some(Box::new(DropComponent::new(args))),
        _ => None,
    }
}

Acceptance Criteria

• graph.start() no longer contains manual match logic.
• Adding a component updates factory automatically.